You are saying this because you aren't a lover of sport betting, maybe i can say you love slot, dice or roulette game. Already those who play this games always see sport betting as something very difficult to hand, but to me sport betting deals with more physical and real live results and you would see how the games are being play and if there were any manipulation you would see it live on the field.
Even though sports betting involves physical and real-time results, manipulations are not always obvious. There are manipulations that are unknown. Poor officiating can be perceived as manipulative at times, but it is simply the referee acting in accordance with his perception of the occurrence.
It is this diverse perception that, despite the game's rules, it is difficult to make objective decisions, which is why game outcomes are difficult to predict. Even among fans, there is always bias when it comes to analyzing issues. Thus, manipulations are difficult to detect.